Group A. PERENNIBRANCHIATA. Family =Menobranchidae=. Menobranchus. Family =Proteidae=. Proteus--olm. Family =Sirenidae=. Siren. Group B. DEROTREMATA. Family =Amphiumidae=. Megalobatrachus. Cryptobranchus (Menopoma). Amphiuma. Suborder (2). SALAMANDRINA. Family =Salamandridae=. Salamandra--salamander. Molge--newt. Onychodactylus. Amblystoma. (Siredon--axolotl, larval Amblystoma). Batrachoseps. Spelerpes (Gyrinophilus). Order 2. LABYRINTHODONTIA. Group =Lepospondyli=. _Branchiosaurus._ Group =Temnospondyli=. _Archegosaurus._ _Nyrania._ _Euchirosaurus._ Group =Stereospondyli=. _Capitosaurus._ _Mastodonsaurus._ Order 3. GYMNOPHIONA. Family =Caeciliidae=. Siphonops. Epicrium. Order 4. ANURA. Suborder (1). AGLOSSA. Family =Xenopidae=. Xenopus. Family =Pipidae=. Pipa--Surinam toad. Suborder (2). PHANEROGLOSSA. Group ARCIFERA. Family =Discoglossidae=. Discoglossus--painted frog. Bombinator--fire-bellied frog. Alytes--midwife frog. Family =Pelobatidae=. Pelobates--toad frog. Family =Hylidae=. Hyla--green tree-frog. Family =Bufonidae=. Bufo--toad. Docidophryne. Family =Cystignathidae=. Ceratophrys--horned frog. Group FIRMISTERNIA. Family =Ranidae=. Rana--common and edible frogs. Family =Engystomatidae=. Brachycephalus. B. SAUROPSIDA. CLASS I. REPTILIA[16]. Order 1. THEROMORPHA. Group =Anomodontia=. _Dicynodon._ _Udenodon._ Group =Placodontia=. _Placodus._ Group =Pariasauria=. _Pariasaurus._ _Elginia._ Group =Theriodontia=. _Dimetrodon._ _Galesaurus._ _Cynognathus._ Order 2. SAUROPTERYGIA. Family =Mesosauridae=. _Mesosaurus._ Family =Nothosauridae=. _Nothosaurus._ Family =Plesiosauridae=. _Plesiosaurus._ _Pliosaurus._ Order 3. CHELONIA. Suborder (1). TRIONYCHIA. Family =Trionychidae=. Trionyx--snapping turtle. Suborder (2). CRYPTODIRA. Family =Dermochelydidae=. Dermochelys (Sphargis)--leathery turtle. Family =Chelonidae=. Chelone--green turtle. Family =Chelydridae=. Chelydra--terrapin. Family =Chersidae=. Testudo--tortoise. Suborder (3). PLEURODIRA. Family =Chelydae=. Chelys. Order 4. ICHTHYOSAURIA. Family =Ichthyosauridae=. _Ichthyosaurus._ Order 5. RHYNCHOCEPHALIA. Suborder (1). RHYNCHOCEPHALIA VERA. Family =Sphenodontidae=. Sphenodon (Hatteria). Family =Rhynchosauridae=. _Hyperodapedon._ Suborder (2). PROGANOSAURIA.